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Finding the Fourth Proportional to 1,661.17, 2,491.74 and 491.25

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Solution

The fourth proportional to 1,661.17, 2,491.74 and 491.25 is: 736.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,661.17 : 2,491.74 = 491.25 : x
  2. Step 2: Convert to fraction form
    1,661.17/2,491.74 = 491.25/x
  3. Step 3: Cross multiply
    1,661.17x = 2,491.74 × 491.25
  4. Step 4: Simplify right side
    1,661.17x = 1,224,067.28
  5. Step 5: Solve for x
    x = 1,224,067.28/1,661.17
  6. Step 6: Final answer
    x = 736.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.